Stop motion for looms



June 29,1948. o, F Doss 2,444,285

STOP MOTION FOR LOOMS Filed-Dec. 11, 194e s sheets-sheet 1 Odie E Doss June 29, 1948. o. F. Doss 2,444,285

^ STOP MOTION FOR LOOMS Filed )Dem 11, 1946 3 Sheets-Sheet 2 Odie E Doss ,@...wdoh www .3mm

3 Sheets-sheet 3 Filed Dec. l1, 1946 Fig. 3.

w w v 3 al. L b 2 mm/ a n .l O 2. rw /KJ. 8 l 6. 4 3 Ii rw /WHLL u u a m m a Patented June 29, 1948 UNITED STATES PATENT OFFICE STOP MOTION FOR LQQMSI Odie. F. Doss, Sycamore, Va.

Application December 11, 1946, Serial No. 715,363

7 Claims. 1.

This: invention relates to a stop motion for a loom and has. for its prim-ary object to. prevent the weaving of faulty goods.

Another objectv is to arrest the flowl of power to a power driven loomI should the clamp.l and cut,- ter failf to grip the severed lling during thepe.- riedl ofl substitution of a. filled' bobbin for an empty bobbin.

In the textile industry many looms are equipped with a transfer mechanism for extracting an empty bobbin from the shuttle and. replacing it with a filled bobbin all operating automatically so as to avoid interruption in the weaving operations. Mosty such looms are equipped with what is known in the industry as a filling knife or clamp and cutter which duringv the operation` of' the transfer mechanism is adapted to advance toward theshuttle, severthe filling from the empty bobbin` and gripI the severed filling, to hold it in position to resume'weaving. In certain instances the clampfai'ls to grip the filling withy the result that continued operation of the loom produces faulty goods and hence loss of production results.

ThisI inventionI has for another object to arrest the motion of thel loom should the clamp fail to grip the filling as it is supposed to do.

The above and other objects may beA attained by employing this invention which embodies among its features a shaft mounted to rock about its longitudinal axis, a lever carried by the shaft to-be engagedlby the clampand cutter advancing means as the clamp and' cutter is advanced therebytoward the shuttle of a loom and thus to rock the shaft-in one direction, said lever being adapted to be engaged by the clamped fill-ing when the clamp and cutter is retracted' thus to rock the shaft in the opposite direction and means actuated bythe shaft to-interruptthe flow of power to the loom when the shaft is rocked with the advance ofthe clamp and cutter and to restore the flow of power to the loom when the shaft is rocked in a reverse direction.

Other features include a mercury switch actuated by theshat to interrupt the flow of power when the shaft is rocked with the advance ofthe clamp and cutter and torestore the flow of power tothe loornwhen the shaft is rocked inA a reverse directionrv and a barrier within the mercuryy switch to retard` the flow of mercury from one; endg thereof tothe, other, thus to avoid the instantancous:` interruption of the owfof; power to the 1.0L'Jltif--y Siai115 other features include counterweights. car-4 ried by the shaft yieldingly to' hold it in either posi-tion'.

In the drawings:

Figure, 1 is a fron-t view of a portionv of., thel transfer mechanism of a loom illustrating in den tail the clamp and cutter and showing this: im,` proved stop motion associated therewith;

Figure 2 is an end view of liligu-rey 1; and,

Figure 3' is a top plan view of Figure 2.

Referring tothe drawings in detail, the clam-p and cutter mechanism designa-ted generally; t0. issuspended from a bar H which projects laterallyfromY ther transfer mechanism in spaced parallel relation withA the lay of the loom in av conventional manner. Suspended from the bar l l adjacent its. free end is a conventional yoke i2 having depending arms carrying adjacent theirlower ends a` guide, track |-3 inwhich a carriage L4. for the clampk and cutter is, slidabl-y` mounted. 'Ihe clamp. and cutter designated generally I5 is of conven-v tionalform and carries adjacent its rear end a laterally extending pin le by1 which the jaws. il and t8k of the clamp and; cutter are openedl and closed through the` medium of a cam t9 carried: onthe endl of the clampi and, cutter actua-te` ing arm 29; The mechanism so` far, described isV of conventional form and is employed inr connection with the transfer mechanism of a. conl-y ventionalloom to sever the filling fromany empty bobbinand hold; it in position toresume the weaving, operation after a filledL bobbin has been re placed in the shuttle, it. being understood that. the knife or clampA andcutter I5Y advances and by reason ofthe movement of the arm, 210 toward the shuttle as, suggested in Figure 3; severs. the fillingandl grips it, between'I the jaws: H; andi i8.

invention coopera-tes in conjunction with` the. fillingknife or clampy andi cutter I -5- and. comprises a support, 2.-! whichY is bolted o r otherwise attached as at 22'` to theA guidev I-3; Al secondl arm o1:- standard 2:3 is: bolted or otherwise secured at 24y to the opposite endof the, yoke. |12; and both. standards 2l' and 23t are provided near their upper ends with aligning; openingsV for the receptionv of a rock shaft; 2@ Oneend of thisl rock shaft is threaded: as at 21S` andi carlries` clamp nuts '21 between, which a depending arm 28 is supported for'movement, with the shaft 25. Fixed adjacent the; lower end of the arm 2 8 are yielding clamp; jaws 29 the purpose ofV which will bemore fullyfhereinatter explained. A collar 30V isv attached asbyset screw 3| tothe end of the shaft 254 opposite the; threaded. end 21' to, bearv against the standard; 23 and prevent. the. shaft. frombeing; withdrawn fromk its: positionA withinl the standards. A lever arm 32 is fixed to the shaft 25 and depends therefrom, so that its lower end lies in the path of movement of the pin I5 of the clamp and cutter I5. It will thus be seen that when the clamp and cutter is advanced toward a shuttle which is being refilled, the arm 32 will be engaged and the shaft 25 rocked in its bearings. It is also to be noted that the lower end of this arm lies in the path of the severed filling when the latter is being moved under the influence of the clamp I5 away from the shuttle, so that with the return stroke of the clamp and cutter I5 the shaft 25 will be rocked to is initial position. If, however,l the clamp of the clamp and cutter I5 fails to grip the filling thread, the shaft 25 will not return to its initial position.

In order to effect the control of the loom through the rocking of the shaft 25 I employ a mercury switch designated generally 33 which is adapted to be controlled by the movements of the shaft 25. In its present embodiment the switch 33 comprises a glass envelope 34 which is clamped between the clamp arms 29 at the lower end of the arm 23 and sealed in one end of this envelope 34 is a pair of spaced parallel electrodes 35 and 36 to the outer ends of which are soldered or otherwise connected as at 31 and 38 suitable conductors 39 and 4!) leading through a cable 4I respectively to a source of electrical energy and to the drive motor of the loom. The envelope 34 contains a conducting fluid 42 such as mercury so that when the switch 33 is rocked about the axis of the shaft 25, Contact of the mercury with the electrodes 35 and 36 will be made or broken according to the direction of movement of the shaft.

In order to retard the flow of the fluid 42 from one end of the envelope 34 to the other, and hence retard the action of the switch, I provide a barrier 43 within the interior of the envelope 34 in which an aperture 44 is formed through which the fluid 42 must flow as the envelope is tilted from one side to the other. The speed of action of the switch is governed by regulating the size of the opening 44 and hence the rapidity with which the fluid may move from one end of the envelope to the other.

In order to hold the rock shaft 25 in one or the other of its positions and yet to permit it easily to be thrown to the opposite position, I provide a pair of counterweights 45 and 46 Iwhich are clamped to the shaft 25 by set screws 41 so that they may easily be adjusted. A stop member 48 is bolted as at 49 to the yoke I2 and extends upwardly and forwardly as illustrated in Figure 2. The upper end of this stop member is provided with a laterally extending arm 49 which lies in a plane parallel with the shaft 25 in spaced relation thereto, and in the path of movement of the counterweights 45 and 46, so as to limit their movements about the axis of the shaft 25, and consequently restrict the arc through which the shaft may rock.

In use it will be understood that one terminal of one of the conductors 39 or 4D is coupled with a source of power while the other terminal of the other conductor is coupled with the drive motor of the loom. With the envelope 34 in the dotted line position shown in Figure 2 the current will flow from one electrode through the conducting iiuid to the opposite electrode and thus provide an uninterrupted flow of power to the loom motor. As the clamp and cutter I5 advances toward the shuttle to sever the filling from an empty bobbin and grip it, the lever 32 will be engaged by the pin I6 so as to rock the shaft 25 into the position illustrated in the full lines in Figure 2, thus tipping the envelope 34 into the full line position illustrated in Figure 2 so as to cause the fluid 42 to start to now through the constricted passage 44 toward the end of the envelope opposite the electrodes 35 and 36. If the clamp I5 grips the filling as it is supposed to do, it will return to its initial position and cause the filling to engage the lever arm 32 and restore the parts to their initial position before the fluid 42 has broken contact with the electrodes 35 and 36. If for any reason the clamp and cutter I5 fails to grip the filling it will be obvious that upon its return stroke no movement of the `.lever 32 will result and consequently the envelope 34 will remain in the full line position illustrated in Figure 2, thus permitting the fluid 42 to break contact with the electrodes 35 and 36 and thus interrupt the flow of power to the drive motor of the loom and hence effecting the stoppage of the loom.

From the foregoing, it is obvious that stopping of the loom is not effected except when the pause of the envelope 34 exceeds a predetermined period of time occasioned by the failure of the clamp and cutter to grip the filling.

Obviously the switch 33 may be placed between the jaws Z9 in a reverse position so that the electrodes 35 and 36 will project in a direction reverse to that shown in the drawings. As a result, the device may be employed in conjunction with a conventional loom stop motion or any suitable relay which, when energized, will effect the stopping of the loom.

While in the foregoing there has been shown and described the preferred embodiment of this invention it is to be understood that minor changes in the details of construction, combination and arrangement of parts may be resorted to without departing from the spirit and scope of the invention as claimed.

1. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a lled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed filling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold the severed lling which includes; a shaft mounted to rock about its longitudinal axis; a lever carried by the shaft to be engaged by an element on the clamp and cutter actuating means as the clamp and cutter is advanced thereby toward the shuttle, thus to rock the shaft in a one direction; said lever being adapted to be engaged by the clamped filling when the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; and means actuated by the shaft to interrupt the fiow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling while the clamp and cutter is being retracted.

2. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a filled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed nlling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold the severed filling which includes; a shaft mounted to rock about its longitudinal axis; a lever carried by the shaft to be engaged by an element on the clamp and cutter actuating means as the clamp and cutter is advanced there by toward the shuttle, thus to rock the shaft in one direction; said lever being adapted to be engaged by the clamped filling when the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; and a mercury switch actuated by the shaft to interrupt the flow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling whilethe clamp and cutter is being retracted.

3. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a filled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed filling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold'the severed filling which includes; a shaft mounted to rock about its longitudinal axis; a lever carried by the shaft to be engaged by an element on the clamp and cutter actuating means as the clamp and cutter is advanced thereby toward the shuttle, thus to rock the shaft in one direction; said lever being adapted to be engaged by the clamped filling when the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; a mercury switch actuated by the shaft to interrupt the flow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling while the clamp and cutter is being retracted, and a barrier Within the mercury switch to retard the flow of mercury therein.

4. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a filled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed filling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold the severed filling which includes; a shaft mounted to rock about its longitudinal axis; a lever carried by the shaft to be engaged by an element on the clamp and cutter actuating means as the clamp and cutter is advanced thereby toward the shuttle, thus to rock the shaft in a one direction; said lever being adapted to be engaged by the clamped filling when the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; means actuated by the shaft to interrupt the flow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling while the clamp and cutter is being retracted, and means carried by the shaft yieldingly to hold it in either rocked position.

5. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a filled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed filling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold the severed filling which includes; a shaft mounted to rock about its longitudinal axis; a lever carried by the shaft to be engaged by an element on the clamp and cutter advancing means as the clamp and cutter is advanced thereby toward the shuttle, thus to rock the shaft in a one direction; said lever being adapted to be engaged by the clamped filling when the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; means actuated by the shaft to interrupt the fiow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling while the clamp and cutter is being retracted, and counterweights carried by the shaft yieldingly to hold it in either rocked position.

6. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a filled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed filling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold the severed filling which includes; a shaft mounted to rock about its longitudinal axis; a lever carried by the shaft to be engaged by an element on the clamp and cutter actuating means as the clamp and cutter is advanced therebytoward the shuttle` thus to rock the shaft in one direction; said lever being adapted to be engaged by the clamped filling Iwhen the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; a mercury switch actuated by the shaft to interrupt the flow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling while the clamp and cutter is being retracted, and counterweights carried by the shaft yieldingly to hold it in either rocked position.

'7. In a power driven loom having a shuttle; a transfer mechanism for extracting an empty bobbin from the shuttle and replacing it with a filled bobbin and a clamp and cutter adapted to advance toward the shuttle, sever the filling from the empty bobbin and grip the severed filling; a stop motion to interrupt the operation of the loom should the clamp fail to grip and hold the severed filling which includes; a shaft mounted to rock about its longitudinal aXis; a lever carried by the shaft to be engaged by an element on the clamp and cutter actuating means as the clamp and cutter is advanced thereby toward the shuttle, thus to rock the shaft in one direction; said lever being adapted to be engaged by the clamped filling when the clamp and cutter is retracted, thus to rock the shaft in the opposite direction; a mercury switch actuated by the shaft to interrupt the fiow of power to the loom when the shaft is rocked with the advance of the clamp and cutter should the clamp fail to grip and hold the filling while the clamp and cutter is being retracted, a barrier within the mercury switch to retard the flow of mercury therein, and counterweights carried by the shaft yieldingly to hold it in either rocked position.

ODIE F. DOSS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,286,392 Northrop Dec. 3, 1918 2,228,225 Brown Jan. '7, 1941 2,365,106 Pugh Dec. 12, 1944 

